I believe this is a 1975 Mustang II liftback, in original Medium Chestnut paint. The 2.5mph rear bumpers (newly required regulation at the time) look to be somewhat of an afterthought. It is equipped with dual exhaust, and a Pinto-style exploding fuel tank.

To give a hint of its quality and performance, Consumer Reports preferred the AMC Gremlin over this Mustang II.